Structure of superclusters and supercluster formation - III. Quantitative study of the Local Supercluster.
Structure of superclusters and supercluster formation - III. Quantitative study of the Local Supercluster.
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DOI：
10.1093/mnras/206.3.529
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发表时间：
1984-02
影响因子：
4.8
通讯作者：
J. Einasto;A. Klypin;E. Saar;S. Shandarin
中科院分区：
文献类型：
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作者：
J. Einasto;A. Klypin;E. Saar;S. Shandarin
我们利用星系的三维分布数据，根据H. Rood和J. Huchra。使用了几种定量方法-相关性和多重性分析、聚类和渗透法。将观测到的分布与由模拟泊松分布、绝热分布和简单分层分布得到的模型分布进行了比较，发现不同大小和密度对比的星系系统在本超星系团中可以用团簇分析方法分离出来。超星系团可以分为星系团和星系串。星系团是弦的密度增强，而弦是超星系团的组成部分。星系弦在超星系团之间形成桥梁，并将所有超星系团连接到一个单一的无限网络中。简单的分层模型和泊松模型的性质与观测到的分布完全不同，而绝热模型更适合观测。然而，绝热模型有太少的系统的中间丰富。另一方面，我们的简单层次模型不包括动态演化。因此，现在就对超星系团的形成做出最终结论还为时过早。观测到的分布具有一个特征尺度长度，对应于从中心星系团到星系弦的过渡;在这个尺度上，相关函数有一个明显的凸起。
We have studied the structure of the Local Supercluster using data on the three-dimensional distribution of galaxies, based on the redshift compilations by H. Rood and J. Huchra. Several quantitative methods have been used – correlation and multiplicity analyses, clustering and percolation methods. The observed distributions have been compared with model distributions, obtained from simulated Poisson, adiabatic and simple hierarchical samples.We have found that galaxy systems of different size and density contrast can be separated in the Local Supercluster by cluster analysis. The supercluster can be divided into clusters and strings of galaxies. Clusters are density enhancements in strings, and strings are constituent parts of superclusters. Galaxy strings form bridges between superclusters and join all superclusters to a single infinite network. Thus systems of galaxies are not isolated objects.Simple hierarchical models as well as the Poisson model have properties completely different from the observed distribution, whereas adiabatic models fit the observations much better. However, the adiabatic model has too few systems of intermediate richness. On the other hand, our simple hierarchical model does not include dynamical evolution. Thus it is premature to draw final conclusions concerning the formation of superclusters.The observed distribution has a characteristic scale-length, corresponding to the transition from the central cluster to strings of galaxies; in the correlation function there is a pronounced bump at this scale.